Seminars & Events
Thursday, September 11, 2014: Dr. Bevil Conway (Wellesley College) will speak on his research in visual neuroscience and color at 4:30 pm in Goodpaster Hall 195.
Monday, October 27, 2014: Dr. Todd Gould (University of Maryland Baltimore) will speak on "Genes to behaviors to treatments in bipolar disorder" at 4:45 pm in Goodpaster Hall 195.Friday, December 5, 2014: Dr. Brian Mathur (University of Maryland Baltimore) will speak on "Braking bad: Aberrant inhibitory neurotransmission in addiction" at 3:00 pm in Goodpaster Hall 195.
Romano, Alison (2012). Modeling disorders with the DIVA model : ataxic dysarthria. (Mentor: A. Jamieson)
This study examined the efficacy of the “directions into velocities of articulators” (DIVA) model, a neurologically plausible [artificial neural network] model of speech production, for studying a motor speech disorder known as “ataxic dysarthria”. Utilizing similar lesioning paradigms as used for DIVA models of stuttering and child deviations from adult speech, we set the connection weights of the critical neurological areas - the cerebellum and its cortical connections - to zero. Three lesions were made: one full cerebellar lesion, one lesion that destroyed the cerebellar neurons used to control auditory timing, and one lesion that destroyed the cerebellar neurons used to control somatosensory timing. The intact model and each of the lesioned models were taught five speech productions, which were recorded and compared based on formant analyses, pitch analysis, and voice analyses. Many of the productions were found to be differentially and significantly affected by the three lesions on many of the acoustic analyses (p<0.001 for many comparisons). Even though the lesions did not display the exact impairments as would be expected from a dysarthric speaker, it seems promising that by creating a lesion that combines elements of the auditory and somatosensory cerebellar lesions, we may be able to more accurately model ataxic dysarthria. With the proposed changes to the model, as well as the proposed future work, this line of research has many implications for modeling, understanding, and eventually treating ataxic dysarthria.